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High-voltage lithium battery cathode material doped with trace amount of tungsten and preparation method thereof

A technology for high-voltage lithium batteries and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low electronic conductivity of lithium iron phosphate, difficulty in meeting high-current charging and discharging, and poor price of cobalt, etc., to achieve charging Improved discharge cycle performance, improved cycle stability, and uniform voltage changes

Inactive Publication Date: 2012-10-10
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt is a relatively scarce resource and is expensive, and it also pollutes the environment; the electronic conductivity of lithium iron phosphate is relatively low, and it is difficult to meet the requirements of high-current charging and discharging
In view of the above deficiencies, the spinel lithium manganese oxide material has become the best choice, but due to the ginger-Taylor effect in the charge and discharge process of the material and the decomposition of the electrolyte under high voltage charge and discharge, the capacity decays
LiNi after doping lithium manganate with nickel 0.5 mn 1.5 o 4 The discharge platform is as high as 4.7 ~ 4.8 V, but it still has the above defects

Method used

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  • High-voltage lithium battery cathode material doped with trace amount of tungsten and preparation method thereof
  • High-voltage lithium battery cathode material doped with trace amount of tungsten and preparation method thereof
  • High-voltage lithium battery cathode material doped with trace amount of tungsten and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of LiNi 0.5 mn 1.4985 W 0.001 o 4 . Weigh and dissolve 0.105 mol lithium acetate, 0.05 mol nickel acetate, 0.14985 mol manganese acetate, 0.0001 mol tungsten hexachloride and 0.315 mol ammonium oxalate in 500 ml deionized water at a molar ratio of 1.05:0.5:1.4985:0.001:3. Control the constant heating and stirring at 60°C, and finally obtain a viscous wet gel, place the wet gel in a vacuum drying oven, and dry it in a vacuum at 90°C to obtain a grass-green xerogel, and then quickly transfer the xerogel to a horse In a Furnace, pre-sinter at 400 °C for 6 hours to obtain a pre-sintered product, cool to room temperature and then grind, then perform secondary sintering at 700 °C for 10 hours, cool to room temperature, and grind to obtain a doped trace tungsten element High-voltage lithium battery cathode material LiNi 0.5 mn 1.4985 W 0.001 o 4 . The prepared material was assembled into a button battery, tested at a constant current charge and discharge...

Embodiment 2

[0032] Preparation of LiNi 0.5 mn 1.4925 W 0.005 o 4 . Weigh 0.105 mol of lithium acetate, 0.05 mol of nickel acetate, 0.14925 mol of manganese acetate, 0.0005 mol of tungsten hexachloride, and 0.315 mol of ammonium oxalate in a molar ratio of 1.05:0.5:1.4925:0.005:3 and dissolve them in 500 ml of deionized water. Control the constant heating and stirring at 50 ℃, and finally get the wet gel, put the wet gel in a vacuum drying oven, and dry it in vacuum at 100 ℃ to get a grass-green xerogel, and then quickly transfer the xerogel to the muffle furnace , pre-sintered at 500 °C for 5 hours to obtain a pre-sintered product, cooled to room temperature and then ground, and then carried out secondary sintering at 900 °C for 8 hours, cooled to room temperature, ground, and finally obtained a high-voltage lithium doped with trace tungsten elements Battery cathode material LiNi 0.5 mn 1.4925 W 0.005 o 4 . The prepared material was assembled into a button battery, and tested at...

Embodiment 3

[0034] Preparation of LiNi 0.5 mn 1.4865 W 0.009 o 4 . Weigh 0.105 mol of lithium acetate, 0.05 mol of nickel acetate, 0.14865 mol of manganese acetate, 0.0009 mol of tungsten hexachloride, and 0.315 mol of ammonium oxalate in a molar ratio of 1.05:0.5:1.4865:0.009:3 and dissolve them in 500 ml of deionized water. Control the constant heating and stirring at 80 ℃, and finally get the wet gel, put the wet gel in a vacuum drying oven, and dry it in vacuum at 80 ℃ to get a grass-green xerogel, and then quickly transfer the xerogel to the muffle furnace , pre-sintered at 600 °C for 4 hours to obtain a pre-sintered product, cooled to room temperature and then ground, and then carried out secondary sintering at 1000 °C for 6 hours, cooled to room temperature, ground, and finally obtained a high-voltage lithium doped with trace tungsten elements Battery cathode material LiNi 0.5 mn 1.4865 W 0.009 o 4. The prepared material was assembled into a button battery, and tested at a...

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Abstract

The invention discloses a high-voltage lithium battery cathode material doped with a trace amount of tungsten and a preparation method thereof. The general formula of the material is LiNi0.5Mn1.5(1-x)WxO4, wherein x is more than 0 and is less than or equal to 0.01. The material is prepared by adopting a sol-gel method, and the preparation method comprises the following steps of: dissolving a soluble lithium salt, a soluble nickel salt, a soluble manganese salt, tungsten hexachloride and ammonium oxalate in deionized water to prepare a mixed solution; heating and stirring until viscous wet gel is obtained; performing vacuum drying on the wet gel to obtain a dried gel; and finally performing pre-sintering, secondary sintering and ball milling to obtain the cathode material. The high-voltage lithium battery cathode material doped with a trace amount of tungsten has high electrochemical performance, and compared with undoped LiNi0.5Mn1.5O4, the LiNi0.5Mn1.5(1-x)WxO4 doped with a trace amount of tungsten is greatly improved in specific capacity and cycle performance.

Description

technical field [0001] The invention relates to a lithium ion positive electrode material, in particular to a high-voltage lithium battery positive electrode material doped with trace tungsten elements and a preparation method thereof. Background technique [0002] In recent decades, with the rapid development of chemical power sources, people's demand for chemical power sources has been increasing from quantity to quality, especially in the fields of power and energy storage, which require chemical power sources to have high specific energy, high specific power, long-term Long life, excellent high and low temperature performance, low cost and environmentally friendly performance. [0003] At present, most of the commercial cathode materials use lithium cobalt oxide, layered lithium nickel cobalt manganese oxide material, olivine type lithium iron phosphate, and spinel type lithium manganese oxide material. Cobalt is a relatively scarce resource and is expensive, and it als...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 陈红雨朱振华胡航郑聖泉李中奇
Owner SOUTH CHINA NORMAL UNIVERSITY
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